Ask your employer if he will contribute to an online course. If the course is related to your work, then there is a strong chance he will, and even if it is not, he still may. This is a step, since this will save you much research if you can get funding from your employer.
Research the Student Aid website (see Resources) to find out if you are eligible for student aid for your studies. Usually this will depend on your background and your academic ability, although it is worth researching to see if you qualify for anything. Send an email to the relevant department and ask if you are eligible for funding.
Choose an online school and see if they offer any types of funding. The benefit of online schooling is that you can choose a school based anywhere, depending on the funding levels available. If the course you wish to study is available in many different places, email them and ask what funding they have available. If you qualify for special funding, they will inform you, and this can help shape your decision.
Look for scholarships that you can apply for. Much like funding, you can either do this with your specific institution, or with funding organizations, although in this case you will have to show special ability in a particular field. If you are particularly talented in a given area, you may be able to find funding.